The performance of trains in the Central Belt is reported to Transport Scotland in three service groups: the Suburban West group, which includes the trains serving the Glasgow area; the Suburban East Group, which includes the trains serving the Edinburgh area; and the Edinburgh and Glasgow Express. The Public Performance Measure for each group over the last eight periods has been as follows: 2016-17 Period 7 Period 8 Period 9 Period 10 Period 11 Period 12 Period 13 2017-18 Period 1 Express E&G 89.5% 86.4% 80.4% 89.0% 92.3% 91.2% 94.0% 94.7% Suburban West 90.7% 87.6% 85.5% 90.5% 92.1% 94.0% 94.0% 94.2% Suburban East 90.9% 87.5% 83.2% 88.9% 92.4% 93.2% 93.1% 93.9% The Scottish Government does not hold data on the number or percentage of trains which arrived within one to two minutes; two to three minutes; and three to four minutes of their booked time, in the form requested, at a sector or route level.